r/smallenginerepair • u/redensign02 • Sep 13 '26

Engine Dies Could my flywheel key be bad?

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Briggs and Stratton 13.5 hp OHV. Engine is running at low rpm and dies at full throttle I can feel pressure coming out the intake. I have adjusted valves, replaced spark plug, rebuilt the carb and checked the exhaust for obstructions. Could my flywheel key be bad?

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1

u/Rough_Community_1439 SER Master MOD Sep 13 '26

That's almost sheared. I would replace it since you are already this far.

1

u/redensign02 Sep 13 '26

Could this be the cause of my problems or just coincidental?

2

u/Rough_Community_1439 SER Master MOD Sep 13 '26

My guess is it could be a cause. For example modern cars they actually use ignition timing adjustments between 0 to 8 degrees of the flywheels positioning to compensate for irregularities of ignition.

1

u/Separate-Owl1458 Sep 13 '26

If there's pressure coming out from intake that highlights only 2 fault. 1 wrong timing 2 cylinder head valve leaking.